1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO. 2 # Objects to go into the VDSO.
3 3
4 # Include the generic Makefile to check the bu !! 4 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
>> 5 # the inclusion of generic Makefile.
>> 6 ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
5 include $(srctree)/lib/vdso/Makefile 7 include $(srctree)/lib/vdso/Makefile
6 8
7 obj-vdso-y := elf.o vgettimeofday.o sigreturn. 9 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
8 10
9 # Common compiler flags between ABIs. 11 # Common compiler flags between ABIs.
10 ccflags-vdso := \ 12 ccflags-vdso := \
11 $(filter -I%,$(KBUILD_CFLAGS)) \ 13 $(filter -I%,$(KBUILD_CFLAGS)) \
12 $(filter -E%,$(KBUILD_CFLAGS)) \ 14 $(filter -E%,$(KBUILD_CFLAGS)) \
13 $(filter -mmicromips,$(KBUILD_CFLAGS)) 15 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
14 $(filter -march=%,$(KBUILD_CFLAGS)) \ 16 $(filter -march=%,$(KBUILD_CFLAGS)) \
15 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 17 $(filter -m%-float,$(KBUILD_CFLAGS)) \
16 $(filter -mno-loongson-%,$(KBUILD_CFLA 18 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
17 $(CLANG_FLAGS) \ 19 $(CLANG_FLAGS) \
18 -D__VDSO__ 20 -D__VDSO__
19 21
20 ifndef CONFIG_64BIT <<
21 ccflags-vdso += -DBUILD_VDSO32 <<
22 endif <<
23 <<
24 # 22 #
25 # The -fno-jump-tables flag only prevents the 23 # The -fno-jump-tables flag only prevents the compiler from generating
26 # jump tables but does not prevent the compile 24 # jump tables but does not prevent the compiler from emitting absolute
27 # offsets. 25 # offsets.
28 cflags-vdso := $(ccflags-vdso) \ 26 cflags-vdso := $(ccflags-vdso) \
29 $(filter -W%,$(filter-out -Wa$(comma)% 27 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
30 -O3 -g -fPIC -fno-strict-aliasing -fno 28 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
31 -mrelax-pic-calls $(call cc-option, -m <<
32 -fno-stack-protector -fno-jump-tables 29 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
33 $(call cc-option, -fno-asynchronous-un !! 30 $(call cc-option, -fno-asynchronous-unwind-tables) \
>> 31 $(call cc-option, -fno-stack-protector)
34 aflags-vdso := $(ccflags-vdso) \ 32 aflags-vdso := $(ccflags-vdso) \
35 -D__ASSEMBLY__ -Wa,-gdwarf-2 33 -D__ASSEMBLY__ -Wa,-gdwarf-2
36 34
37 ifneq ($(c-gettimeofday-y),) 35 ifneq ($(c-gettimeofday-y),)
38 CFLAGS_vgettimeofday.o = -include $(c-gettimeo 36 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
39 37
40 # config-n32-o32-env.c prepares the environmen 38 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
41 # library on a 64bit kernel. 39 # library on a 64bit kernel.
42 # Note: Needs to be included before than the g 40 # Note: Needs to be included before than the generic library.
43 CFLAGS_vgettimeofday-o32.o = -include $(src)/c !! 41 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
44 CFLAGS_vgettimeofday-n32.o = -include $(src)/c !! 42 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
45 endif 43 endif
46 44
47 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTR !! 45 CFLAGS_REMOVE_vgettimeofday.o = -pg
48 46
49 ifdef CONFIG_MIPS_DISABLE_VDSO !! 47 #
50 obj-vdso-y := $(filter-out vgettimeofday.o, !! 48 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
>> 49 # the base address of VDSO, the linker will emit a R_MIPS_PC32
>> 50 # relocation in binutils > 2.25 but it will fail with older versions
>> 51 # because that relocation is not supported for that symbol. As a result
>> 52 # of which we are forced to disable the VDSO symbols when building
>> 53 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
>> 54 # can't use other methods to get the base address of VDSO please refer to
>> 55 # the comments on that file.
>> 56 #
>> 57 ifndef CONFIG_CPU_MIPSR6
>> 58 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
>> 59 $(warning MIPS VDSO requires binutils >= 2.25)
>> 60 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
>> 61 ccflags-vdso += -DDISABLE_MIPS_VDSO
>> 62 endif
51 endif 63 endif
52 64
53 # VDSO linker flags. 65 # VDSO linker flags.
54 ldflags-y := -Bsymbolic --no-undefined -soname !! 66 VDSO_LDFLAGS := \
55 $(filter -E%,$(KBUILD_CFLAGS)) -shared !! 67 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
56 -G 0 --eh-frame-hdr --hash-style=sysv !! 68 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
57 !! 69 -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
58 CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE) !! 70
59 !! 71 CFLAGS_REMOVE_vdso.o = -pg
60 # Check that we don't have PIC 'jalr t9' calls !! 72
61 quiet_cmd_vdso_mips_check = VDSOCHK $@ !! 73 GCOV_PROFILE := n
62 cmd_vdso_mips_check = if $(OBJDUMP) --di !! 74 UBSAN_SANITIZE := n
63 then (echo >&2 "$@: PIC <<
64 rm -f $@; /bin/fa <<
65 75
66 # 76 #
67 # Shared build commands. 77 # Shared build commands.
68 # 78 #
69 79
70 quiet_cmd_vdsold_and_vdso_check = LD $@ 80 quiet_cmd_vdsold_and_vdso_check = LD $@
71 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 81 cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
>> 82
>> 83 quiet_cmd_vdsold = VDSO $@
>> 84 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
>> 85 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
72 86
73 quiet_cmd_vdsoas_o_S = AS $@ 87 quiet_cmd_vdsoas_o_S = AS $@
74 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o 88 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
75 89
76 # Strip rule for the raw .so files 90 # Strip rule for the raw .so files
77 $(obj)/%.so.raw: OBJCOPYFLAGS := -S 91 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
78 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 92 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
79 $(call if_changed,objcopy) 93 $(call if_changed,objcopy)
80 94
81 hostprogs := genvdso !! 95 hostprogs-y := genvdso
82 96
83 quiet_cmd_genvdso = GENVDSO $@ 97 quiet_cmd_genvdso = GENVDSO $@
84 define cmd_genvdso 98 define cmd_genvdso
85 $(foreach file,$(filter %.raw,$^),cp $ 99 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
86 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg. 100 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
87 endef 101 endef
88 102
89 # 103 #
90 # Build native VDSO. 104 # Build native VDSO.
91 # 105 #
92 106
93 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS 107 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
94 108
95 targets += $(obj-vdso-y) 109 targets += $(obj-vdso-y)
96 targets += vdso.lds 110 targets += vdso.lds
97 targets += vdso.so.dbg.raw vdso.so.raw 111 targets += vdso.so.dbg.raw vdso.so.raw
98 targets += vdso.so.dbg vdso.so 112 targets += vdso.so.dbg vdso.so
99 targets += vdso-image.c 113 targets += vdso-image.c
100 114
101 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 115 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
102 116
103 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $ 117 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
104 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $ 118 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
105 119
106 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags- 120 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
107 121
108 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj- 122 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
109 $(call if_changed,vdsold_and_vdso_chec 123 $(call if_changed,vdsold_and_vdso_check)
110 124
111 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $( 125 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
112 $(obj)/genvdso FORCE 126 $(obj)/genvdso FORCE
113 $(call if_changed,genvdso) 127 $(call if_changed,genvdso)
114 128
115 obj-y += vdso-image.o 129 obj-y += vdso-image.o
116 130
117 # 131 #
118 # Build O32 VDSO. 132 # Build O32 VDSO.
119 # 133 #
120 134
121 # Define these outside the ifdef to ensure the 135 # Define these outside the ifdef to ensure they are picked up by clean.
122 targets += $(obj-vdso-y:%.o=%-o32.o) 136 targets += $(obj-vdso-y:%.o=%-o32.o)
123 targets += vdso-o32.lds 137 targets += vdso-o32.lds
124 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 138 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
125 targets += vdso-o32.so.dbg vdso-o32.so 139 targets += vdso-o32.so.dbg vdso-o32.so
126 targets += vdso-o32-image.c 140 targets += vdso-o32-image.c
127 141
128 ifdef CONFIG_MIPS32_O32 142 ifdef CONFIG_MIPS32_O32
129 143
130 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32. 144 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
131 145
132 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vds 146 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
133 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vds 147 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
134 148
135 $(obj)/%-o32.o: $(src)/%.S FORCE 149 $(obj)/%-o32.o: $(src)/%.S FORCE
136 $(call if_changed_dep,vdsoas_o_S) 150 $(call if_changed_dep,vdsoas_o_S)
137 151
138 $(obj)/%-o32.o: $(src)/%.c FORCE 152 $(obj)/%-o32.o: $(src)/%.c FORCE
139 $(call cmd,force_checksrc) 153 $(call cmd,force_checksrc)
140 $(call if_changed_rule,cc_o_c) 154 $(call if_changed_rule,cc_o_c)
141 155
142 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccfl 156 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
143 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 157 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
144 $(call if_changed_dep,cpp_lds_S) 158 $(call if_changed_dep,cpp_lds_S)
145 159
146 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.ld 160 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
147 $(call if_changed,vdsold_and_vdso_chec 161 $(call if_changed,vdsold_and_vdso_check)
148 162
149 $(obj)/vdso-o32-image.c: VDSO_NAME := o32 163 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
150 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.db 164 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
151 $(obj)/genvdso FORCE 165 $(obj)/genvdso FORCE
152 $(call if_changed,genvdso) 166 $(call if_changed,genvdso)
153 167
154 obj-y += vdso-o32-image.o 168 obj-y += vdso-o32-image.o
155 169
156 endif 170 endif
157 171
158 # 172 #
159 # Build N32 VDSO. 173 # Build N32 VDSO.
160 # 174 #
161 175
162 targets += $(obj-vdso-y:%.o=%-n32.o) 176 targets += $(obj-vdso-y:%.o=%-n32.o)
163 targets += vdso-n32.lds 177 targets += vdso-n32.lds
164 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 178 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
165 targets += vdso-n32.so.dbg vdso-n32.so 179 targets += vdso-n32.so.dbg vdso-n32.so
166 targets += vdso-n32-image.c 180 targets += vdso-n32-image.c
167 181
168 ifdef CONFIG_MIPS32_N32 182 ifdef CONFIG_MIPS32_N32
169 183
170 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32. 184 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
171 185
172 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vds 186 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
173 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vds 187 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
174 188
175 $(obj)/%-n32.o: $(src)/%.S FORCE 189 $(obj)/%-n32.o: $(src)/%.S FORCE
176 $(call if_changed_dep,vdsoas_o_S) 190 $(call if_changed_dep,vdsoas_o_S)
177 191
178 $(obj)/%-n32.o: $(src)/%.c FORCE 192 $(obj)/%-n32.o: $(src)/%.c FORCE
179 $(call cmd,force_checksrc) 193 $(call cmd,force_checksrc)
180 $(call if_changed_rule,cc_o_c) 194 $(call if_changed_rule,cc_o_c)
181 195
182 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccfl 196 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
183 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 197 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
184 $(call if_changed_dep,cpp_lds_S) 198 $(call if_changed_dep,cpp_lds_S)
185 199
186 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.ld 200 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
187 $(call if_changed,vdsold_and_vdso_chec 201 $(call if_changed,vdsold_and_vdso_check)
188 202
189 $(obj)/vdso-n32-image.c: VDSO_NAME := n32 203 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
190 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.db 204 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
191 $(obj)/genvdso FORCE 205 $(obj)/genvdso FORCE
192 $(call if_changed,genvdso) 206 $(call if_changed,genvdso)
193 207
194 obj-y += vdso-n32-image.o 208 obj-y += vdso-n32-image.o
195 209
196 endif 210 endif
197 211
198 # FIXME: Need install rule for debug. 212 # FIXME: Need install rule for debug.
199 # Needs to deal with dependency for generation 213 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
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